Jeff_m
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Sorry for the delay. I just now saw your request. In case you are still interested, here's my sequence. I use the sharedSerialPortManager to loop through the serial ports, looking for a port description that includes the string "usbmodem". When found, I create the path as "/dev/cu." plus the full modem description (e.g., "/dev/cu.usbmodem123456781") then I open that path using ORSSerialPort serialPortWithPath:. I send the string "ATE0+VCID=1" to the moden serial port using sendData: and process the responses using the ORSSerialPortDelegate method didReceiveData:.